Update Changelog for Chat 1.3.0 release (#35148)

Author: jimchou-dev

sdk/communication/azure-communication-chat/CHANGELOG.md

@@ -1,18 +1,12 @@
 # Release History
 
-## 1.3.0 (Unreleased)
+## 1.3.0 (2024-04-10)
 
 ### Features Added
 
 - Updated `chat_attachment.attachment_type`to include type `file` to support ACS users to recieve files shared by Teams user.
 - Added support for a new communication identifier `MicrosoftTeamsAppIdentifier`.
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.2.0 (2023-12-04)
 
 ### Features Added